A cosmetic container with a transparent window has a main base, a cover with the transparent window and mounted on the main base, a lateral movement base mounted between the main base and the cover, a longitudinal movement base mounted on the main base and a transmission element connecting to the lateral and longitudinal movement bases. The transparent window allows a user to recognize kinds and colors of cosmetics that are mounted on the lateral movement base therethrough. When the transmission element is driven by the longitudinal movement base, the transmission element drives the lateral movement base consequently to push the lateral and longitudinal movement bases outwardly. Thus, it is easy to open or close the cosmetic container with only one hand.